发动机控制系统时间限制派遣分析的若干可靠性理论问题

推进技术 ›› 2018, Vol. 39 ›› Issue (3): 667-675.

发动机控制系统时间限制派遣分析的若干可靠性理论问题

陆中¹,李乃鑫¹,周伽²,张燕军^1,3

南京航空航天大学民航学院，江苏南京 211106,南京航空航天大学民航学院，江苏南京 211106,中国东方航空江苏有限公司飞机维修部，江苏南京 211113,南京航空航天大学民航学院，江苏南京 211106; 扬州大学机械工程学院，江苏扬州 225127

发布日期:2021-08-15
作者简介:陆中，男，博士，副教授，研究领域为系统可靠性与航空器适航技术。
基金资助:
国家自然科学基金(61403192；U1333118)；江苏省自然科学基金(BK20130811；BK20150455)。

On Reliability Theory of Time Limited Dispatch Analysis in Engine Control Systems

College of Civil Aviation，Nanjing University of Aeronautics and Astronautics，Nanjing 211106，China,College of Civil Aviation，Nanjing University of Aeronautics and Astronautics，Nanjing 211106，China,Department of Aircraft Maintenance，China Eastern Airlines Jiangsu Limited，Nanjing 211113，China and College of Civil Aviation，Nanjing University of Aeronautics and Astronautics，Nanjing 211106，China; College of Mechanical Engineering，Yangzhou University，Yangzhou 225127，China

Published:2021-08-15

摘要/Abstract

摘要： 面向民用飞机与商用航空发动机的型号合格审定，需研究发动机控制系统时间限制派遣 (TLD) 分析的可靠性理论问题。基于TLD分析的开环与闭环马尔可夫模型，利用连续时间马尔可夫过程理论推导了发动机控制系统平均完整性水平的定义，该定义应当准确表述为不考虑维修时间的推力控制丧失 (LOTC) 频率；分别构建了单故障与多故障TLD分析的马尔可夫模型，分析了单故障与多故障TLD模型的特点。结果表明:与单故障模型相比，多故障TLD模型具有瞬时LOTC率是时间的函数、存在非派遣 (ND) 状态以及多故障状态有多种维修策略等特点；针对周期检查维修方式，利用条件寿命分布推导了检测间隔期发现故障条件下的平均故障前时间，进而求得平均故障暴露时间的计算公式。最后，结合某型实际FADEC系统给出了本文所提出理论的应用实例。

关键词: 系统安全性；时间限制派遣；马尔可夫过程；维修策略；适航审定

Abstract: To facilitate the type certification of civil aircraft and commercial aircraft engines， reliability theoretical issues of Time Limited Dispatch (TLD) analysis for engine control systems are studied. Based on the open and closed Markov models of TLD analysis， the definition of the average integrity level of engine control systems is derived by using the theory of the time continuous Markov process. It is concluded that the accurate definition of the average integrity level is the Loss of Thrust Control (LOTC) frequency with negligible maintenance time. The Markov models of the single fault and multiple - fault TLD analysis are constructed respectively; and the characteristics of both models are analyzed based on the models. It is showed that the multiple - fault TLD model has three characteristics including the time varying instantaneous LOTC rate， the existence of no-dispatch (ND) states， and the multiple maintenance strategies of the multiple - fault state compared with the single fault TLD model. To the periodic inspection approach， the formula of the mean time to failure is derived by using the conditional life distribution in the case that faults are observed in the periodic inspection; and then， the formula of the average fault exposure time is derived. Finally， a case is given to illustrate the application of our proposed theories via a practical type of FADEC system.

Key words: System safety；Time limited dispatch；Markov process；Maintenance strategy；Airworthiness certification

陆中,李乃鑫,周伽,张燕军. 发动机控制系统时间限制派遣分析的若干可靠性理论问题[J]. 推进技术, 2018, 39(3): 667-675.

LU Zhong¹,LI Nai-xin¹,ZHOU Jia²,ZHANG Yan-jun^1,3. On Reliability Theory of Time Limited Dispatch Analysis in Engine Control Systems[J]. Journal of Propulsion Technology, 2018, 39(3): 667-675.

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